I'm not sure about the future about our relationship, advice please?

I'm a 24 year old, and my boyfriend is 25. We both have been together for 5 years. About 2 years ago, I stumbled upon a book called "Beyond betrayal: taking charge of your life after boyhood ual abuse" in his room, under his bed. I mean I have to admit I was pretty shocked and upset about this, but I decided to just keep it to myself and whenever he's ready to tell me, he'll tell me. I thought it would be unfair to push something like this on him. Anyway we have been together for 5 years. We are considering a future together but what good is it when he doesn't trust me enough to tell me about his secrets and his feelings? He has mive problems when dealing with his parents, and his family. When we got together he hated women a lot as well, but I guess I managed to change that part of him. We talked a bit about marriage and our plans for the future but in the back of my mind this question keeps haunting me. Does he love me enough to tell me about this? I don't know what to do. I don't want to sound selfish but I don't know how else to think about it. Maybe he's really scared of telling me. I don't know. Any advice is appreciated